I spent three days in Kisii trying to speak to the authorities, but nobody, neither the police nor the local government officials would talk to me.

As night drew in, and it was time for me to leave, Joseph walked with me from his village to where my car was parked.

When we arrived, he begged me to take him with me to Mombasa, where I am based.

It was very difficult for me to leave him behind.

As I drove away I passed signs pinned to trees, warning witches that they would be tracked down.

"We know you by your names", someone had typed in bold.

To listen to the full broadcast of Kenya's Witch Lynchings, tune in to African Perspectiveon the BBC World Service.The program is first broadcast on Saturday 27 June at 1106 GMT. It will be available online from 2106 GMT, for one week.

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